// Copyright (c) 2008, Willow Garage, Inc.
// Copyright (c) 2017, Open Source Robotics Foundation, Inc.
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#include "rviz_common/panel_dock_widget.hpp"

#include <QApplication>
#include <QChildEvent>
#include <QCloseEvent>
#include <QHBoxLayout>
#include <QLabel>
#include <QString>
#include <QToolButton>

#include "rviz_common/load_resource.hpp"

namespace rviz_common
{

PanelDockWidget::PanelDockWidget(const QString & name)
: QDockWidget(name),
  collapsed_(false),
  forced_hidden_(false)
{
  QWidget * title_bar = new QWidget(this);

  QPalette pal(palette());
  pal.setColor(QPalette::Window, QApplication::palette().color(QPalette::Mid));
  title_bar->setAutoFillBackground(true);
  title_bar->setPalette(pal);
  title_bar->setContentsMargins(0, 0, 0, 0);

  QToolButton * close_button = new QToolButton();
  close_button->setIcon(rviz_common::loadPixmap("package://rviz_common/icons/close.png"));
  close_button->setIconSize(QSize(10, 10));

  connect(close_button, SIGNAL(clicked()), this, SLOT(close()));

  title_label_ = new QLabel(name, this);

  icon_label_ = new QLabel(this);
  icon_label_->setContentsMargins(2, 2, 0, 0);
  setIcon(QIcon());

  QHBoxLayout * title_layout = new QHBoxLayout();
  title_layout->setContentsMargins(2, 2, 2, 2);
  title_layout->addWidget(icon_label_, 0);
  title_layout->addWidget(title_label_, 1);
  title_layout->addWidget(close_button, 0);
  title_bar->setLayout(title_layout);
  setTitleBarWidget(title_bar);
}

void PanelDockWidget::setWindowTitle(QString title)
{
  QDockWidget::setWindowTitle(title);
  title_label_->setText(title);
}


void PanelDockWidget::setIcon(QIcon icon)
{
  if (icon.isNull()) {
    icon_label_->setVisible(false);
  } else {
    icon_label_->setVisible(true);
    icon_label_->setPixmap(icon.pixmap(16, 16));
  }
}

void PanelDockWidget::setCollapsed(bool collapse)
{
  if (collapsed_ == collapse || isFloating()) {return;}


  if (collapse) {
    if (isVisible()) {
      PanelDockWidget::setVisible(false);
      collapsed_ = collapse;
    }
  } else {
    PanelDockWidget::setVisible(true);
    collapsed_ = collapse;
  }
}

void PanelDockWidget::setContentWidget(QWidget * child)
{
  if (widget()) {
    disconnect(widget(), SIGNAL(destroyed(QObject*)), this, SLOT(onChildDestroyed(QObject*)));
  }
  setWidget(child);
  if (child) {
    connect(child, SIGNAL(destroyed(QObject*)), this, SLOT(onChildDestroyed(QObject*)));
  }
}

void PanelDockWidget::closeEvent(QCloseEvent * event)
{
  Q_UNUSED(event);
  emit closed();
}

void PanelDockWidget::onChildDestroyed(QObject *)  // NOLINT: cpplint thinks this is a cast?
{
  deleteLater();
}

void PanelDockWidget::save(Config config)
{
  config.mapSetValue("collapsed", collapsed_);
}

void PanelDockWidget::load(Config config)
{
  config.mapGetBool("collapsed", &collapsed_);
}

void PanelDockWidget::setVisible(bool visible)
{
  requested_visibility_ = visible;
  QDockWidget::setVisible(requested_visibility_ && !forced_hidden_);
}

void PanelDockWidget::overrideVisibility(bool hidden)
{
  forced_hidden_ = hidden;
  setVisible(requested_visibility_);
}

}  // namespace rviz_common
